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IEEE Transactions on Antennas and Propagation

Issue 6 • November 1975

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  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • A technique for extracting the poles and residues of a system directly from its transient response

    Publication Year: 1975, Page(s):777 - 781
    Cited by:  Papers (182)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB)

    A novel approach for systematically deriving the complex poles and residues of a structure from a set of time-domain data is presented. The method is based on Prony's algorithm which involves the inversion of two matrices and a solution of the zeros of annth degree polynomial,nbeing the number of desired poles. Two numerical examples are presented and several numerical advant... View full abstract»

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  • Prediction methods for rain attenuation statistics at variable path angles and carrier frequencies between 13 and 100 Ghz

    Publication Year: 1975, Page(s):786 - 791
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (627 KB)

    Fade depth and space diversity statistics of propagation along earth-satellite paths have been calculated from radar reflectivity data of rain using modeling procedures. The reflectivity data base was obtained during the summer of 1973 at Wallops Island, Va., using a high resolutionSband radar interfaced with a computer and digital processing system. Fade statistics have been calculated... View full abstract»

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  • Radiating dipole antenna with tapered impedance loading

    Publication Year: 1975, Page(s):811 - 814
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (402 KB)

    The far-field radiated waveform and field pattern from a thin dipole antenna in the transmission line approximation are considered when the antenna is driven by a voltage generator of waveformV_{0}u(t), whereu(t)is the unit step function. The antenna is loaded with a tapered form of loading and is permitted to include reactance as well as resistance. Analytical and numerical ... View full abstract»

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  • Analysis of an anisotropic dielectric radome

    Publication Year: 1975, Page(s):841 - 846
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    A grooved-dielectric flat radome panel is analyzed in terms of an arbitrary direction of incidence onNplanar slabs each of which is dielectrically anisotropic, homogeneous, and lossless. Using this model for the grooved panel, transmission coefficients of 90 percent or greater over a 10:1 frequency band and over0degto60degincidence angle are predicted and demonstra... View full abstract»

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  • Comments on methods applied to the evaluation of lateral waves

    Publication Year: 1975, Page(s):870 - 872
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (247 KB)

    To apply the method of steepest descent to the evaluation of lateral waves when the observing point and the source are located in different media with respect to each other, it is recommended that one first change the variable of integration according to Snell's law and then apply the method of operators. The merits and limitations of this method, compared with the usual direct one, are discussed. View full abstract»

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  • Correction to "Application of electromagnetic inverse boundary conditions to profile characteristics inversion of conducting spherical shapes"

    Publication Year: 1975, Page(s): 872
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1975, Page(s): c4
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    Freely Available from IEEE
  • Phased array antennas with dielectric fin aperture loading

    Publication Year: 1975, Page(s):824 - 829
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Planar waveguide array structures in which some form of dielectric matching is introduced, either in the form of a continuous sheet above the array face or dielectric plugs in the apertures, have received considerable attention in the literature. An alternative construction has one central dielectric fin or two edge dielectric fins in each rectangular waveguide aperture. Schaedla [2] has given a t... View full abstract»

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  • The far-field response of a step-excited linear antenna using SEM [singularity expansion method]

    Publication Year: 1975, Page(s):834 - 838
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Previous investigation of the use of the singularity expansion method (SEM) for analyzing antennas or scatterers has concentrated on the behavior of currents and charges on a conducting body. In this paper the previous work is extended by defining the far-field natural modes for the linear antenna. The transient radiation pattern is then computed for a step-excited center-fed linear antenna. View full abstract»

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  • Paraboloidal reflector offset fed with a corrugated conical horn

    Publication Year: 1975, Page(s):817 - 819
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A paraboloidal reflector, offset fed with a corrugated conical horn, has been examined as a possible antenna for use in millimeter wave communications systems when minimization of interference is an important consideration. Low far-out and back-lobe radiation were primary objectives. Experimentally obtained data, representative of performance at 37 GHz, is presented. When appropriately shielded to... View full abstract»

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  • Study of efficiency of spherical Gregorian reflector

    Publication Year: 1975, Page(s):819 - 824
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The use of the current distribution method to analyse the field in the image space of a spherical Gregorian antenna when the main dish is illuminated by a linearly polarized plane wave is discussed. It is shown that the incident field distribution at the subdish is rather irregular, although it can be approximated by a smooth Gaussian distribution curve. In addition, it is possible to design a sim... View full abstract»

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  • Application of Fourier transforms for microwave radiometric inversions

    Publication Year: 1975, Page(s):797 - 806
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Existing microwave radiometer technology now provides a suitable method for remote determination of the ocean surface's absolute brightness temperature. To extract the brightness temperature of the water from the antenna temperature, an unstable Fredholm integral equation of the first kind is solved. Fourier transform techniques are used to invert the integral after it is placed into a cross corre... View full abstract»

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  • On the aperture field of a solid cylindrical antenna

    Publication Year: 1975, Page(s):862 - 864
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The situation of a solid cylindrical antenna excited by a narrow circumferential gap is considered, and an approximation which is realistic, simple, and very accurate is obtained for the aperture electric field. View full abstract»

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  • High frequency scattering from an open-ended semi-infinite cylinder

    Publication Year: 1975, Page(s):770 - 776
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A simple high-frequency asymptotic expression for the backscattered field from a semi-infinite hollow circular cylinder is derived from the exact Weiner-Hopf solution. The resultant equations are valid for both polarizations and can be easily numerically evaluated. Comparisons of the computed results and the measured data acquired through the utilization of a sub-nanosecond pulse radar system are ... View full abstract»

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  • Phase and amplitude scintillations at 9.6 GHz on an elevated path

    Publication Year: 1975, Page(s):850 - 854
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Deep fading, e.g., > 40 dB, was observed at 9.6 GHz on a 150 km path with terminals at 3025 and 3300 m elevations and with no significant illumination of the earth's surface. Fades at two antennas separated horizontally by 100 m were largely uncorrelated. Phase variability was also measured and is presented in terms of spectra and coherency between antennas with 10 m and 100 m horizontal spacin... View full abstract»

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  • Transient scattering of an L-shaped wire using the singularity expansion method

    Publication Year: 1975, Page(s):838 - 841
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A bent thin wire in the shape of an L is analyzed in free space to determine the transient scattering characteristics by the application of the singularity expansion method (SEM) to a coupled set of Hallén-like equations. The principal results of a parametric study to determine the effect of the bend position on the complex resonant frequencies are reported here. The frequency and the time do... View full abstract»

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  • Attenuation of 8.6 and 3.2 mm radio waves by clouds

    Publication Year: 1975, Page(s):782 - 786
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Measured attenuations associated with a variety of cloud conditions at wavelengths near 8.6 and 3.2 mm are reported. Two specific events, during which heavy rain clouds covered the sky, are examined and statistical data collected over a six-month period on a variety of cloud types are presented. The number of observations of some cloud types was not large and it was not possible to account for the... View full abstract»

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  • Volume-type holographic antenna

    Publication Year: 1975, Page(s):807 - 810
    Cited by:  Papers (20)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A new type of holographic antenna based on the principle of the volume hologram is proposed. The characteristics of the prototype are examined. The antenna has a unidirectional beam with a front-to-back ratio of 20 dB. The practical frequency handwidth is about 10 percent of the center frequency. The antenna is unique in that the feed point is placed in the plane of the holographic plate so that b... View full abstract»

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  • Dynamic measurement of forward scattering

    Publication Year: 1975, Page(s):846 - 850
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A dynamic method for the measurement of forward scattering in a radio anechoic chamber is described. The quantity determined is the induced-field-ratio (IFR) of conducting cylinders. The determination of the IFR is highly sensitive to 1) multiple scattering between the cylinder and the obpring antenna and 2) extraneous scattering from the lining of the anechoic chamber. In order to eliminate the i... View full abstract»

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  • Phase and amplitude scintillations in the 10 to 40 GHz band

    Publication Year: 1975, Page(s):792 - 797
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Simultaneous measurements of phase and amplitude variability were made on a 64 km slant path using five radio frequencies: 9.55, 19.1, 22.2, 25.4, and 33.3 GHz. The three middle frequencies were chosen for their relation to water vapor absorption. The amplitude data show occasional fades in excess of 20 dB superimposed on ubiquitous smaller scintillations of several decibels. The latter generally ... View full abstract»

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  • The input admittance of a TEM excited annular slot antenna

    Publication Year: 1975, Page(s):829 - 834
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The admittance problem solution of a TEM excited annular slot antenna embedded in an infinite perfectly conducting ground plane is accomplished in the rigorous Maxwell equation-boundary value sense. The net result is a complete closed form solution for the admittance which includes the effects of all beyond-cutoff higher order TM modes. Infinite integrals related to the TEM admittance and to pertu... View full abstract»

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  • Optimized symmetric discrete line arrays

    Publication Year: 1975, Page(s):860 - 862
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A generalization of Dolph's method for the synthesis of discrete antenna arrays is applied to six different symmetric line arrays. Based on these examples, it is concluded that 1) the field patterns of optimized symmetric line arrays with the same number of elements and with the same aperture are virtually indistinguishable and 2) optimized arrays with an odd number of elements are substantially b... View full abstract»

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  • Radiation pattern synthesis of planar antennas using the iterative sampling method

    Publication Year: 1975, Page(s):764 - 769
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A synthesis method is presented for determining an excitation of an arbitrary (but fixed) planar source configuration. The desired radiation pattern is specified over all or part of the visible region. It may have multiple and/or shaped main beams with low sidelobes. The iterative sampling method is used to find an excitation of the source which yields a radiation pattern that approximates the des... View full abstract»

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  • Near-field centripetal scattering from dielectric spheres

    Publication Year: 1975, Page(s):864 - 866
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The fields scattered from small dielectric spheres illuminated by a plane wave have been computed as part of a study of spherical dielectric antennas. Studies of scattering of 3 cm wavelength from a 6.6 cm diameter sphere of dielectric constant between 2 and 3 show large regions on the surface of the sphere where the Poynting vector is inwardly directed. These regions form sidelobes of inwardly di... View full abstract»

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IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Editor-in-Chief                                             Danilo Erricolo